The former University of Texas star fractured his skull after falling down two flights of stairs in late July at a friend's house in Austin.
Kindle was signed to a one-year, $320,000 contract with no signing bonus or incentives and placed on the reserve non-football injury list. The Ravens could tender him or allow him to become a free agent.
Kindle's disappointing first season dipped even lower when he was arrested Dec. 26 on drunken-driving charges.
Kindle also had off-the-field incidents at Texas, including crashing his car into an apartment building when he said he was texting while driving.
The Associated Press contributed to this report.